U.S. CMS Detector Operations Outline Cathy Newman-Holmes 13 - PowerPoint PPT Presentation

U.S. CMS Detector Operations Outline Cathy Newman-Holmes 13 February 2013 • Overview of CMS Operations  Collisions - 2012  Efficiency, Down time • Survey of US CMS subsystems  2012 Performance • Operations Cost and Milestones • Summary U.S. CMS Detector Operations 13 February 2013 C. Newman-Holmes 1

pp Collisions March - Dec 2012 • 8 TeV proton-proton collisions 11 March 2012 – 16 December 2012. • CMS recorded 21.79 fb -1 from 23.30 fb -1 delivered (= 94%). • This is more than 4 x the data sample at the last review (March, 2012). • Also note that efficiency for 2011 data collection was 91%. U.S. CMS Detector Operations 13 February 2013 C. Newman-Holmes 2

p-Pb Collisions January – February 2013 • Proton – Lead collisions started 20 Jan 2013. • CMS recorded 31.13 nb -1 from 31.69 nb -1 delivered (= 98%). U.S. CMS Detector Operations 13 February 2013 C. Newman-Holmes 3

Average efficiency in 2012 from M. Chamizo Llatas Period Delivered* Recorded* Efficiency Downtime Dead-time Luminosity fb- Luminosity fb- (luminosity) 1 1 April-June 6.78 6.26 92.3% 5.9% 1.8% July-21Aug ** 4.97 4.73 95.1% 3.8% 1% 22Aug-16 2.99 2.74 94.4% 4.1% 1.5% Sep 26 Sept-7Oct 1.44 1.37 95.1% 3.4% 1.5% 7 Oct-6 Dec 6.87 6.51 94.8% 3.7% 1.5% ** Fills 2957, 2992 and 2993 with B=OFF in August have been excluded: ~0.5/fb Huge effort from all sub-systems, shifts crews, on-call experts, to reach this level and maintain it U.S. CMS Detector Operations 13 February 2013 C. Newman-Holmes 4

Recorded vs Delivered vs Certified Luminosity March – Dec, 2012 From S. Maruyama “Golden” luminosity Luminosity for Muon Analyses • Efficiency of good (“golden”) selection = 91.1%.  All systems are certified as good for these data. • “Golden” plot above shows 19.6 fb -1 good for any analysis. • We have 20.7 fb -1 for muon only analyses (efficiency = 96.3%).  Tracker and muon systems are certified good for these data. U.S. CMS Detector Operations 13 February 2013 C. Newman-Holmes 5

Fraction of live channels 2010-2012 98% 98% 99% 99% Dec 2012 • CMS working well after three years of operation. • Thanks to the huge effort of many people to maintain the detector. • Note that order of subsystems on vertical scale is reversed for 2010 – 2012. from M. Chamizo Llatas U.S. CMS Detector Operations 13 February 2013 C. Newman-Holmes 6

Run Time Logger • Plots on this page are from the web-based Run Time Logger – for all 2012 proton- proton collisions. U.S. CMS Detector Operations 13 February 2013 C. Newman-Holmes 7

Run Time Logger - categories • Largest single source of lost luminosity (21%) was due to tracker DAQ. • All groups have been working hard to reduce downtime. U.S. CMS Detector Operations 13 February 2013 C. Newman-Holmes 8

Pile-up History from M. Chamizo Llatas Period Peak average pile up 2010 2010 3.5 2011 18 2012 34 2011 2012 LHC increasing bunch charges β * = 0.6 m and bunch charges β * from 1.5m to 1m 1.6x10 11 protons/bunch Two “special high pile” up fills in 2011 Two “special high pile” up fills in 2012…will they became “standard” operation in 2012 become “standard operation” after LS1 ? U.S. CMS Detector Operations 13 February 2013 C. Newman-Holmes 9

Run Coordination organization for 2012 Upgrade Run Coordinator: M. Chamizo-Llatas Project U.S. names in red. Deputies: G. Rakness, C. Delaere Cross- coordination Organization G.Rakness support/training Detectors : A.Barisone coordination area Sub-detectors BRM LUMI L1 HTL DQM Offline Heavy Tracker, ECAL,HCAL,DT,RPC,CSC Ops Ops mgr Ops mgr Ops mgr Ops mgr Ops mgr Ops mgr Ions mgr Ops mgr DPG coordinator: PPD C.Delaere L1 Tracker ECAL HCAL DT CSC RPC DPG DPG DPG DPG DPG DPG DPG A.Heister P.Merkel A.Bornheim O.Kodolov M.Pelliccioni T.Cox C.Carrillo D.Petyt C.Battilana A.Venturi a L.Guiducci V.Paltchik K.Bunkowsk & V.Mihai S.Banerjee i Detectors Projects U.S. CMS Detector Operations 13 February 2013 C. Newman-Holmes 10

US CMS Detector Operations- Level 2 Managers New Deputy Detector Operations Manager: Vivian O’Dell. • Blue italics Appointed since last review (both were already deputy L2s). • Drawings of subdetectors and U.S. institutions working on each are in the background slides at the end of this talk. • Upgrade R&D will be described by Daniela Bortoletto in a later talk. U.S. CMS Detector Operations 13 February 2013 C. Newman-Holmes 11

Tracker 2012 Performance from S. Nahn • Highest priority: Stable Running to maximize useful data sample. Detector Start Now % 2012 % TIB/TID 95.02 94.63 TOB 98.13 97.79 TEC+ 98.81 98.81 TEC- 99.13 99.13 Tracker 97.75 97.48 Failures understood, potentially addressable in LS1. Active, Masked U.S. CMS Detector Operations 13 February 2013 C. Newman-Holmes 12

Tracker Uptime from S. Nahn • CMS: 21.8 fb -1 collected  TK related lost lumi 0.231 fb -1 , ~ 1% absolute  Offline: Additional 0.166 (HV off) + 0.070 (misc) fb -1 bad • Major sources fixed or mitigated  Firmware upgrades for robust handling of intermittent data corruption  Soft Error Recognition/Recovery - 1- 2 minute “stop start” replaced with < 30 second recovery. • HV turn-on was automated. U.S. CMS Detector Operations 13 February 2013 C. Newman-Holmes 13

Effects of CPU and memory improvements from K. Stenson ● Many improvements over the past 2 years have yielded substantial savings in CPU and memory use. Some of this comes from better compilers but most comes from improved tracking code. ● But CPU time still shows significant non-linearities with pileup. ● Results for track reconstruction only; data results from 2011 high pileup run with about 35 pileup. 200 events from 2011 high pileup run 1 U.S. CMS Detector Operations 13 February 2013 C. Newman-Holmes 14 4

Track Reconstruction Success • Tracker is crucial for charged lepton reconstruction (e, µ) • From a high-pileup run, we have an event with 78 reconstructed vertices. U.S. CMS Detector Operations 13 February 2013 C. Newman-Holmes 15

Pixel Detector - 2012 from S. Zenz • # of working channels has not changed much in 2012. U.S. CMS Detector Operations 13 February 2013 C. Newman-Holmes 16

Single Event Upset Automatic Recovery • Radiation from proton collisions causes single event effects in detector electronics.  Scope of effects range from being hardly noticeable to stopping the run.  Started to become an issue with increasing luminosity in 2011. • 2012: full commissioning of automatic soft error recovery.  Depending on the error and the system, this is done via hardware or software. • Systems continue to automate recovery from known problems. • Pixels Overall: 3-4 minute recovery time → 12 seconds • Saved 15 hours of running in 2012! U.S. CMS Detector Operations 13 February 2013 C. Newman-Holmes 17

Pixel Luminosity Telecope (PLT) From J. Hegeman • During the 2011 Extended Technical Stop, a PLT demonstrator was installed on the CASTOR table. • Proto-PLT up-and-running since first 2012 beams. • Running unattended since July, 2012 (with on-call coverage). • First generation DAQ works and electronics perform as designed. • In the 2012 pilot run, a decrease of diamond pulse height at high particle rates was observed.  A high priority effort is to confirm this All hardware is in-hand. One effect can be eliminated through quarter PLT will be installed as removal of surface material. dry-run in March 2013. U.S. CMS Detector Operations 13 February 2013 C. Newman-Holmes 18

ECAL detector status Good overall status of ECAL and ES. Very little evolution in number of dead channels Active channels: EB EB+EE EB EE ES 2011-Nov 99.07 99.16 98.72 95.1 2012-Febr 99.04 99.16 98.54 95.1 2012-Mar 99.04 99.16 98.54 96.9 2012-Dec 98.97 99.11 98.38 96.8 • Number of bad channels stable EE- • Very few single bad channels EE+ • Periodic good health checks to record in detail the performance of each channel and monitor their evolution vs time • Possibility to recover of a large fraction of the masked 5x5 regions in EE+ in LS1 From F. Cavallari U.S. CMS Detector Operations 13 February 2013 C. Newman-Holmes 19

New Laser from F. Cavallari ● The new laser was procured/commissioned/installed on schedule and used throughout the 2012 run. ● There were no hardware failures on the new laser itself, in contrast to the old lasers that required frequent interventions (lamps replaced etc). • After some initial operational optimization at P5, very stable operation. • In summer some degradation traced to auxiliary optics. • End of summer some degradation suspected to be caused by issues internal to the laser. reduced pump current from ● 55 to 45 A for precaution. Very stable operation since then. ● The quality of the transparency corrections was not degraded. U.S. CMS Detector Operations 13 February 2013 C. Newman-Holmes 20

ECAL Performance from B. Cox - mass resolution important for Higgs discovery. Both electrons in EB One e in EE + one in EB. U.S. CMS Detector Operations 13 February 2013 C. Newman-Holmes 21